Move some variable name to task_cx to task_cx_ptr2

os/src/task/mod.rs

@@ -47,11 +47,11 @@ lazy_static! {
 impl TaskManager {
     fn run_first_task(&self) {
         self.inner.borrow_mut().tasks[0].task_status = TaskStatus::Running;
-        let next_task_cx = self.inner.borrow().tasks[0].get_task_cx_ptr2();
+        let next_task_cx_ptr2 = self.inner.borrow().tasks[0].get_task_cx_ptr2();
         unsafe {
             __switch(
                 &0usize as *const _,
-                next_task_cx,
+                next_task_cx_ptr2,
             );
         }
     }
@@ -84,13 +84,13 @@ impl TaskManager {
             let current = inner.current_task;
             inner.tasks[next].task_status = TaskStatus::Running;
             inner.current_task = next;
-            let current_task_cx = inner.tasks[current].get_task_cx_ptr2();
-            let next_task_cx = inner.tasks[next].get_task_cx_ptr2();
+            let current_task_cx_ptr2 = inner.tasks[current].get_task_cx_ptr2();
+            let next_task_cx_ptr2 = inner.tasks[next].get_task_cx_ptr2();
             core::mem::drop(inner);
             unsafe {
                 __switch(
-                    current_task_cx,
-                    next_task_cx,
+                    current_task_cx_ptr2,
+                    next_task_cx_ptr2,
                 );
             }
         } else {

os/src/task/switch.S

@@ -8,7 +8,10 @@
     .section .text
     .globl __switch
 __switch:
-    # __switch(current_task_cx: &*const TaskContext, next_task_cx: &*const TaskContext)
+    # __switch(
+    #     current_task_cx_ptr2: &*const TaskContext,
+    #     next_task_cx_ptr2: &*const TaskContext
+    # )
     # push TaskContext to current sp and save its address to where a0 points to
     addi sp, sp, -13*8
     sd sp, 0(a0)

os/src/task/switch.rs

 global_asm!(include_str!("switch.S"));
 
 extern "C" {
-    pub fn __switch(current_task_cx: *const usize, next_task_cx: *const usize);
+    pub fn __switch(
+        current_task_cx_ptr2: *const usize,
+        next_task_cx_ptr2: *const usize
+    );
 }